
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<style>
body,div,p,ul,li,input{margin:0;padding:0;}
ul{list-style-type:none;}
/* outline：轮廓，一般浏览器会在元素获得焦点的时候，给予其焦点框 */
a{color:#fff;outline:none;text-decoration:none;}
body{font:700 24px/1.5 Arial;}
#calc{position:relative;width:300px;background:#000;margin:10px auto;}
/* font-size/line-height，用来规定字体尺寸和行高 */
#calc p{color:#fff;text-align:right;font:12px/20px Arial;padding:0 5px;}
#calc .f-text{border:0;width:290px;height:84px;text-align:right;font:700 50px/84px Arial;background:url(img/inputBg.jpg) repeat-x;padding:0 5px;}
#calc ul{position:relative;overflow:hidden;zoom:1;background:url(img/bg.jpg);padding:0 0 17px 8px;}
#calc ul li{float:left;width:63px;height:41px;margin:17px 10px 0 0;}
/* 增加了a元素，进行块元素转换，设置元素宽高，保证行高和元素高度一致，方便设置text-align:center效果; */
#calc ul li a{display:block;width:63px;height:41px;line-height:41px;text-align:center;background:url(img/btn.png) no-repeat;}
/* background-position设置背景图像的起始位置 */
#calc ul li a:hover{background-position:-63px 0;}
#calc ul li.btn-1 a{background-position:0 -41px;}
#calc ul li.btn-1 a:hover{background-position:-63px -41px;}
#calc ul li.btn-2{position:absolute;top:174px;right:0;height:99px;}
#calc ul li.btn-2 a{height:99px;line-height:99px;background-position:0 -164px;}
#calc ul li.btn-2 a:hover{background-position:-63px -164px;}
#calc ul li.btn-3{width:136px;}
#calc ul li.btn-3 a{width:136px;background-position:0 -82px;}
#calc ul li.btn-3 a:hover{background-position:0 -123px;}
#formula{position:absolute;top:20px;background:none;border:0;font:700 12px/1.5 Arial;width:280px;padding:3px 15px 0 5px;text-align:right;}
</style>
<script>
window.onload = function ()
{
	var oCalc = document.getElementById("calc");
	var aA = oCalc.getElementsByTagName("a");
	var aInput = oCalc.getElementsByTagName("input")[0];
	var oFormula = document.getElementById("formula");
	var s = false;
	var i = 0;
	
	for (i = 0; i < aA.length; i++){
		aA[i].onfocus = function ()
		{
			/* blur函数运用 */
			this.blur()	
		};
		aA[i].onclick = function ()
		{
			switch(this.innerHTML)
			{
				case "c":    /* 设置c位的重置功能*/
					aInput.value =  0;
					oFormula.value = "";
					break;
				case "%":
					count("%")
					break;
				case "÷":
					count("/")
					break;
				case "×":
					count("*")
					break;
				case "-":
					count("-")
					break;
				case "+":
					count("+")
					break;
				case "=":
					s || (oFormula.value += aInput.value);
					aInput.value = eval(oFormula.value.replace(/\%\/\*\-\+/,''));
					aInput.value = aInput.value.substr(0,10).replace("NaN",0);
					s = true;
					break;
				case ".":
					if(aInput.value.search(/[\.\%\/\*\-\+]/) != -1)
					break;
				default:
					s && (aInput.value = 0, oFormula.value = "", s = false);
					aInput.value.length < 10 && (aInput.value = (aInput.value + this.innerHTML).replace(/^[0\%\/\*\-\+](\d)/,"$1"));
			}
		}	
	}
	
	function count(a)
	{

		if(s)
		{
			oFormula.value = aInput.value + a;
			aInput.value = a;	
			s = false;
		}
		else
		{
			/[\%\/\*\-\+]$/.test(aInput.value) || (oFormula.value += aInput.value);
			aInput.value = a;
			/[\%\/\*\-\+]$/.test(oFormula.value) || (oFormula.value += aInput.value);
			oFormula.value = oFormula.value.slice(-1) != a ? oFormula.value.replace(/.$/,a) : oFormula.value
		}
	}
}
</script>
<title>网页计算器</title>
</head>
<body>
<div id="calc">
    <p>By - Ferris QQ:21314130</p>
    <input class="f-text" type="text" readonly="readonly" maxlength="9" value="0" />
    <ul>
        <li class="btn-1"><a href="javascript:void(0)">c</a></li>
        <li class="btn-1"><a href="javascript:void(0)">%</a></li>
        <li class="btn-1"><a href="javascript:void(0)">÷</a></li>
        <li class="btn-1"><a href="javascript:void(0)">×</a></li>
        <li><a href="javascript:void(0)">7</a></li>
        <li><a href="javascript:void(0)">8</a></li>
        <li><a href="javascript:void(0)">9</a></li>
        <li class="btn-1"><a href="javascript:void(0)">-</a></li>
        <li><a href="javascript:void(0)">4</a></li>
        <li><a href="javascript:void(0)">5</a></li>
        <li><a href="javascript:void(0)">6</a></li>
        <li class="btn-1"><a href="javascript:void(0)">+</a></li>
        <li><a href="javascript:void(0)">1</a></li>
        <li><a href="javascript:void(0)">2</a></li>
        <li><a href="javascript:void(0)">3</a></li>
        <li class="btn-2"><a href="javascript:void(0)">=</a></li>
        <li class="btn-3"><a href="javascript:void(0)">0</a></li>
        <li><a href="javascript:void(0)">.</a></li>
    </ul>
    <input id="formula" type="text" readonly="readonly" value="" />
</div>
</body>
</html>
